<?php
namespace Grafika\Imagick\DrawingObject;

use Grafika\DrawingObject\Polygon as Base;
use Grafika\DrawingObjectInterface;

/**
 * Class Polygon
 *
 * @package Grafika
 */
class Polygon extends Base implements DrawingObjectInterface
{
    public function draw($image)
    {
        $draw = new \ImagickDraw();
        $draw->setStrokeWidth($this->borderSize);

        if (null !== $this->fillColor) {
            $fillColor = new \ImagickPixel($this->fillColor->getHexString());
            $draw->setFillColor($fillColor);
        } else {
            $draw->setFillOpacity(0);
        }

        if (null !== $this->borderColor) {
            $borderColor = new \ImagickPixel($this->borderColor->getHexString());
            $draw->setStrokeColor($borderColor);
        } else {
            $draw->setStrokeOpacity(0);
        }

        $draw->polygon($this->points());

        $image->getCore()->drawImage($draw);

        return $image;
    }

    protected function points()
    {
        $points = [];
        foreach ($this->points as $i => $pos) {
            $points[$i] = [
                'x' => $pos[0],
                'y' => $pos[1]
            ];
        }
        if (count($points) < 3) {
            throw new \Exception('Polygon needs at least 3 points.');
        }

        return $points;
    }
}
